UV Index in Norwalk, United States

Last updated: June 2, 2025

Understanding the UV Index in Norwalk, United States is essential for safeguarding your skin and overall health. With UV levels peaking at an intensity of 11 during midday, awareness can help you prevent sunburn and long-term skin damage. Norwalk's humid continental climate (Dfa) contributes to significant UV exposure, particularly in the summer months, where clear skies and high temperatures increase the risk of harmful ultraviolet radiation. By keeping an eye on the UV Index, residents and visitors can enjoy the outdoors while taking necessary precautions to protect against sun-related health risks.

Hourly UV Index in Norwalk

The UV Index for today shows a dramatic rise as the sun ascends into the sky. Starting at a mild 1 by 07:00, the index gradually builds, reaching 3 by 09:00 and peaking at an intense 11 at 13:00—a level where sun protection is crucial. From this pinnacle, the values start to decline, tapering off to 10 at 14:00 and then gradually decreasing through the afternoon and evening, with values of 6 at 16:00 and sliding down to 1 by 19:00. Plan your outdoor activities accordingly, and remember to protect your skin during those peak hours!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	3	moderate	30 min
10:00	6	high	25 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Norwalk

Throughout the year, UV Index levels fluctuate significantly, impacting sun exposure and potential skin damage. The high-risk months, identified by an increased UV Index, are April through August, where levels reach a concerning 8 to 11, categorized as either very high to extreme. Notably, June exhibits the peak UV Index of 11, necessitating vigilant sun protection. Residents and visitors are advised to minimize sun exposure during these months, seeking shade and applying broad-spectrum sunscreen regularly, especially during peak hours. In contrast, winter months like January, November, and December present a moderate risk with an UV Index of 3 to 4, allowing for more lenient outdoor activities while still practicing sun safety.

Monthly Maximum UV Index for Norwalk, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Norwalk. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Norwalk, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Norwalk UV Index with Other United States Cities

The table above highlights how UV exposure in Norwalk compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Norwalk's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Norwalk	3	5	6	8	9	11	10	9	8	6	4	3
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5